What is the normal voltage range for a rear oxygen sensor?

1 Answers
DiIsabel
07/30/25 4:05am
The normal voltage range for a rear oxygen sensor is between 0.1V and 0.9V, with an average value typically around 0.4V to 0.5V. This data is primarily used for feedback to the ECU for comparison, ensuring the proper functioning of the three-way catalytic converter. Additionally, the faster the voltage frequency changes, the better the sensor's performance. In engines equipped with three-way catalytic converters to reduce exhaust emissions, the oxygen sensor is an essential component. Since the purification capability of the three-way catalyst for CO, HC, and NOx drops sharply when the air-fuel ratio deviates from the theoretical value, an oxygen sensor is installed in the exhaust pipe to detect oxygen concentration in the exhaust and send feedback signals to the ECU. The ECU then adjusts the fuel injection quantity to maintain the air-fuel ratio near the theoretical value.
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